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Q.

How many oxygen atoms are required during complete oxidation of 1 molecule of PGAL in aerobic respiration?

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a

3

b

6

c

12

d

24

answer is B.

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Detailed Solution

For the complete oxidation of one molecule of glucose, 6 molecules of oxygen is required or 12 atoms of oxygen is required. 1 glucose molecule undergoes glycolysis to produce 1 molecule of PGAL and 1 molecule of DHAP and DHAP is converted to PGAL to take part in further glycolytic reactions. As we have only 1 molecule of PGAL as substrate, the oxygen requirement will be half. Therefore, for oxidation of 1 molecule of PGAL there is requirement of 3 molecules or 6 atoms of oxygen.

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